Magnetic chemically peculiar stars with variable periods
Zdeněk Mikulášek (PřF MU Brno)
The majority of magnetic chemically peculiar (mCP) stars exhibit periodic
light, magnetic, radio, and spectroscopic variations that can be adequately
explained by the model of a rigidly rotating main-sequence star with
persistent surface structures. Nevertheless, there are a few quite diverse
mCP stars whose periods vary on timescales of decades while the shapes of
their phase curves remain unchanged. Alternations in the rotational period
variations, suspected in the case of CU Vir and V901 Ori, bring further new
insight into this theoretically unexpected phenomenon. The possible causes
of this mysterious behaviour will be also discussed.
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